FixKit AI

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An AI coding agent for your real codebase

“I already have code and want an agent that edits, runs and fixes it.”

Agents that work in your terminal or editor on an existing repo. Pick by where you like to work.

Fix it yourself in 3 steps

  1. Open the agent in your project folder.
  2. Describe the bug or feature and ask it to run the tests or app to prove the fix.
  3. Review the diff before you commit.

Copy this prompt

In this repo, [describe the bug or feature]. Before changing code, run the tests or app and show me the current behavior. Make the change, rerun to prove it works, and stop. Finish with what changed and how you verified it.

Fill in the [brackets]. Each prompt says when the AI should stop, so it doesn't wander off.

Tools for this

#1 · Our pick

Claude Code

Best for: Serious work on real repos

Anthropic's agent for your terminal, IDE and desktop. Reads the whole repo, runs commands and tests, and handles large multi-file changes well.

Visit Claude Code ↗
#2

Cursor

Best for: Editor-first developers

A VS Code-style editor built around AI, with background agents. The comfortable choice if you live in an editor.

Visit Cursor ↗
#3

OpenAI Codex

Best for: Delegating tasks as PRs

OpenAI's coding agent, in the CLI and in the cloud. Good at handing off well-scoped tasks that come back as pull requests.

Visit OpenAI Codex ↗
#4

GitHub Copilot

Best for: Teams already on GitHub

Autocomplete plus an agent mode, inside the editors you already use and on GitHub itself. Often already paid for by your employer.

Visit GitHub Copilot ↗
#5

Windsurf

Best for: Cursor alternative

An agentic editor in the same family as Cursor. Worth a try if Cursor's workflow doesn't click for you.

Visit Windsurf ↗
#6

Cline

Best for: Open source, any model

Open-source agent inside VS Code. Bring your own API key and pick any model.

Visit Cline ↗
#7

Aider

Best for: Terminal minimalists

Open-source pair programmer in the terminal that commits as it goes. Lightweight and model-agnostic.

Visit Aider ↗

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